Gear ratio

AA Ford Discussion Group relating to the repair and restoration of your AA Ford.
Post Reply
Wickstop
Posts: 13
Joined: May 15th, 2014, 5:29 pm
Body Type: Unk
Model Year: 1928

Gear ratio

Post by Wickstop »

Is it possible to chance the gear ratio on my 1928 AA with a worn drive rear end. Please advise
User avatar
spectria
Posts: 1874
Joined: May 15th, 2008, 9:53 pm
Body Type: Mail Truck, Stakebed
Model Year: 1931
Location: Quincy, Ca.

Re: Gear ratio

Post by spectria »

Wickstop wrote:Is it possible to chance the gear ratio on my 1928 AA with a worn drive rear end. Please advise
Yes, you would need the set of worm and worm drive gears that you prefer.
Do you know what ratio you have now?
Dave in Quincy, Ca. I love Pics!!!! Post them All!!! :)
Join the Ford Model AA Truck Club - membership form at http://www.fmaatc.org
KimVanOrder
Posts: 753
Joined: August 11th, 2013, 4:25 pm
Body Type: 82-A Platform
Model Year: 1928
Location: Hamilton, Mich.

Re: Gear ratio

Post by KimVanOrder »

Wickstop wrote:Is it possible to chance the gear ratio on my 1928 AA with a worn drive rear end. Please advise


Yes: The worm and Ring can be changed. The low speed, 7:25 to 1 ratio has an "A" stamped on the rear drivers side of the housing. The high speed is 5:17 to 1 with a "B" stamped on the housing. I am in the process of the same thing. (but still scratching my head if it is the right thing to do for my truck and it's history).

KVO
KVO
Dec. '28 AA
User avatar
1crosscut
Posts: 877
Joined: December 25th, 2010, 7:22 pm
Body Type: 82-A
Model Year: 1929
Location: Lincoln, NE

Re: Gear ratio

Post by 1crosscut »

KimVanOrder wrote:
Wickstop wrote:Is it possible to chance the gear ratio on my 1928 AA with a worn drive rear end. Please advise


Yes: The worm and Ring can be changed. The low speed, 7:25 to 1 ratio has an "A" stamped on the rear drivers side of the housing. The high speed is 5:17 to 1 with a "B" stamped on the housing. I am in the process of the same thing. (but still scratching my head if it is the right thing to do for my truck and it's history).

KVO
KVO - If I were you I wouldn't hesitate to switch out the gears in your rear end to a set of high speed gears. Everything is internal and no one will know it was done except you will go a bit faster. Mine was at one time a low speed rear end and the gears were switched out to high speed gears long before I got it.
The hard part is finding good high speed gears to make the switch.
------------
Dave
User avatar
blgitn
Posts: 201
Joined: July 6th, 2013, 6:36 am
Body Type: 275-A
Model Year: 1931
Location: West Point, VA 23181

Re: Gear ratio

Post by blgitn »

Does anybody make other ratios?
I'd be interested in something like a 4:1, instead of searching for a warford.
R/ Roger.
Stakebed
Posts: 1223
Joined: June 14th, 2007, 7:29 pm
Body Type: Grainbox
Model Year: 1929
Location: Illinois

Re: Gear ratio

Post by Stakebed »

Not that i know of...warford is pretty much only way to knock ratio down even more...
Bob C
Posts: 1442
Joined: April 24th, 2003, 11:50 am
Body Type: Mail truck, Stake tr
Model Year: 1931
Location: SO CAL

Re: Gear ratio

Post by Bob C »

You could install a Mitchell overdrive or the 4-speed with 4th overdrive.

Bob
Attachments
aries aa transmission 001.jpg
aries aa transmission 001.jpg (82.59 KiB) Viewed 6361 times
od resize.jpg
od resize.jpg (155.83 KiB) Viewed 6361 times
User avatar
blgitn
Posts: 201
Joined: July 6th, 2013, 6:36 am
Body Type: 275-A
Model Year: 1931
Location: West Point, VA 23181

Re: Gear ratio

Post by blgitn »

Wow! I didn't know you could get a Mitchell for an AA. What ratios are available? Who's running one and what do you think?
R/ Roger.
Post Reply